REACTIONS WITH STEEL OF COMPOUNDS CONTAINING CHEMICAL GROUPS USED IN LUBRICANT ADDITIVES

摘要

The chemical reactions between steel of a type used in aircraft-engine cylinder barrels and compounds containing reactive groups commonly found in lubricant additives were investigated. The products formed by reaction at temperatures from 400° to 650℉ were analyzed by reflection electron diffraction. The principal corrosive action found was caused by oxygen carried in the reactant as dissolved air or dissolved moisture. Additive reactivities were in agreement with predictions based on knowledge of the chemical reactivity of the groups and linkages tested. The reaction product could he identified when complication of the diffraction patterns by oxides of iron was eliminated. Compound formation observed in this investigation supports the theory of boundary-lubricant additive action, which states that additives form compounds of low shear strength at metal surfaces and prevent seizure and high abrasive wear when no fluid film is present.